package com.hxzy.common.util;


import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * 获取IP地址工具类
 */
public class IpUtil {


    /**
     * 获取IP
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request) {
        if (request == null) {
            return "unknown";
        }
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Forwarded-For");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : ip;
    }

    public static boolean internalIp(String ip) {
        byte[] addr = textToNumericFormatV4(ip);
        return (internalIp(addr) || "127.0.0.1".equals(ip));
    }

    private static boolean internalIp(byte[] addr) {
        if ( addr ==null || addr.length < 2) {
            return true;
        }

        byte b0 = addr[0];
        byte b1 = addr[1];
        byte SECTION_1 = 10;
        byte SECTION_2 = -84;
        byte SECTION_3 = 16;
        byte SECTION_4 = 31;
        byte SECTION_5 = -64;
        byte SECTION_6 = -88;
        switch (b0) {
            case 10:
                return true;
            case -84:
                if (b1 >= 16 && b1 <= 31)
                    return true;
            case -64:
                switch (b1) {
                    case -88:
                        return true;
                }
                break;
        }
        return false;
    }

    public static byte[] textToNumericFormatV4(String text) {
        if (text.length() == 0) {
            return null;
        }
        byte[] bytes = new byte[4];
        String[] elements = text.split("\\.", -1);
        try {
            long l;
            int i;
            switch (elements.length) {
                case 1:
                    l = Long.parseLong(elements[0]);
                    if (l < 0L || l > 4294967295L)
                        return null;
                    bytes[0] = (byte)(int)(l >> 24L & 0xFFL);
                    bytes[1] = (byte)(int)((l & 0xFFFFFFL) >> 16L & 0xFFL);
                    bytes[2] = (byte)(int)((l & 0xFFFFL) >> 8L & 0xFFL);
                    bytes[3] = (byte)(int)(l & 0xFFL);
                    return bytes;
                case 2:
                    l = Integer.parseInt(elements[0]);
                    if (l < 0L || l > 255L) {
                        return null;
                    }
                    bytes[0] = (byte)(int)(l & 0xFFL);
                    l = Integer.parseInt(elements[1]);
                    if (l < 0L || l > 16777215L) {
                        return null;
                    }
                    bytes[1] = (byte)(int)(l >> 16L & 0xFFL);
                    bytes[2] = (byte)(int)((l & 0xFFFFL) >> 8L & 0xFFL);
                    bytes[3] = (byte)(int)(l & 0xFFL);
                    return bytes;
                case 3:
                    for (i = 0; i < 2; i++) {
                        l = Integer.parseInt(elements[i]);
                        if (l < 0L || l > 255L) {
                            return null;
                        }
                        bytes[i] = (byte)(int)(l & 0xFFL);
                    }
                    l = Integer.parseInt(elements[2]);
                    if (l < 0L || l > 65535L) {
                        return null;
                    }
                    bytes[2] = (byte)(int)(l >> 8L & 0xFFL);
                    bytes[3] = (byte)(int)(l & 0xFFL);
                    return bytes;
                case 4:
                    for (i = 0; i < 4; i++) {
                        l = Integer.parseInt(elements[i]);
                        if (l < 0L || l > 255L) {
                            return null;
                        }
                        bytes[i] = (byte)(int)(l & 0xFFL);
                    }
                    return bytes;
            }
            return null;
        } catch (NumberFormatException e) {
            return null;
        }
    }

    public static String getHostIp() {
        try {
            return InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException unknownHostException) {
            return "127.0.0.1";
        }
    }

    public static String getHostName() {
        try {
            return InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException unknownHostException) {
            return "";
        }
    }
}
